Year	Percent
1999-01-01	27.675
2000-01-01	29.275
2001-01-01	31.975
2002-01-01	31.425
2003-01-01	34.375
2004-01-01	32.125
2005-01-01	31.875
2006-01-01	30.050
2007-01-01	29.375
2008-01-01	27.850
2009-01-01	29.100
2010-01-01	32.475
2011-01-01	32.925
2012-01-01	35.950
2013-01-01	38.275
2014-01-01	38.500
2015-01-01	37.900
2016-01-01	33.875
2017-01-01	36.750